【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=

问题描述:

【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=

很累
-3x-2y